"And I'm so furious, at you for making me feel this way, but what can I say?"

She also sings "I've got a boyfriend, he's older than us, he's in the club doing I don't know what" and that her mystery man has "ocean blue eyes".

Taylor Swift accepts the award for album of the year for 1989 at the 58th annual Grammy Awards on Monday, Feb. 15, 2016, in Los Angeles. (Photo by Matt Sayles/Invision/AP) (Image: Matt Sayles/Invision/AP)

Following its release online, the star's fans took to Twitter to share their thoughts on the song while also trying to decode its meaning.

Swift has had several high-profile romances over the years, including with actor Tom Hiddleston, 36, and DJ Calvin Harris, 33, and she is known for using her experiences as song-writing material.

She is currently believed to be in a relationship with 26-year-old British actor Joe Alwyn.

Fans have speculated that the song could be about either of her famous former partners, or Alwyn.

Undated file photos of Calvin Harris and Taylor Swift, who have knocked superstar couple Beyonce and Jay Z from the number one spot in the Forbes list of the highest paid celebrity couples

One wrote on Twitter: "Hmm Tom has blue eyes. Calvin has blue eyes. Joe has blue eyes. Taylor should write a song called 'My Blue-Eyed Boys'."

Another said: "I think this song is about Joe, Calvin and Tom £Gorgeous."

One said that they thought the first verse is about Harris, and the second about Hiddleston, while one fan said they thought the song is a "diss" to the DJ.

The mention of her subject's age in the song prompted many fans to search online.